What flow temperatures are you currently running?

These are magnetic compasses, read from the wrong perspective of a photo. I trust the flow indicator of the UWP more.

That may be so, but 0 remains basically 0 even with parallax error.

I will adjust the liter numbers from the heating circuit distributor again this evening.

By the way, the minimum flow rate of the heat pump is 310 liters and the nominal flow rate is 540 liters.

I will also check the pump capacity again this evening when I get back to the system.

Accordingly, if I calculate backwards, it would be max. 540 l/h : 60 = 9 L/min, which would have to be divided among the number of heating circuits?

So 9 L/min : 14 heating circuits = 0.64 l/min if all heating circuits had to receive the same flow rate, which is not the case.

So 9 L/min : 14 heating circuits = 0.64 L/min if all heating circuits had to get the same flow rate, which is not the case.

That's why the question was already asked above, what was calculated?

Maybe you also throttled too much and the difference comes from something still going through the ÜSV. I think it’s the same as with me. Unfortunately, you can’t completely close it, only set it to max. response pressure.

The calculation is wrong. Mine were also set according to the calculation. Without exception, all circles are strongly throttled. Great calculation.

In my opinion, the most sensible thing is to open everything fully at first and then work your way in.

In my opinion, it makes the most sense to open everything fully at the beginning and then fine-tune.

Honestly, that's exactly what I did. Flow everywhere at max and see how the heat level settles. If a room gets too warm, throttle it down and that's it.
In the end, nothing had to be throttled; the flow remained at max everywhere. We have a constant 22.0 - 22.3 degrees throughout the house and that's it.

Enviable. Had a good plumber?